A373265 Numbers k such that k' / gcd(k,k') is of the form 4m+2, where k' stands for the arithmetic derivative of k, A003415.

9, 16, 20, 21, 25, 33, 49, 52, 57, 65, 68, 69, 77, 85, 93, 108, 116, 121, 129, 133, 135, 141, 145, 148, 161, 164, 169, 177, 185, 192, 201, 205, 209, 212, 213, 217, 221, 237, 240, 244, 249, 252, 253, 265, 289, 292, 300, 301, 305, 309, 315, 321, 329, 341, 351, 356, 361, 365, 375, 377, 381, 388, 393, 396, 404, 413, 417

Offset: 1

Author

Antti Karttunen, Jun 01 2024

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Crossrefs

Setwise difference A369002 \ A369005.

Cf. A003415, A083345, A373264 (characteristic function).

Programs

PARI

isA373265 = A373264;